MUSEUM OF COMPARATIVE ZOOLOGY. 3/5 



Order OSTRACODA. 



Family CYPRIDID^. 



Genus CYPRIS. 



Cypris Donnetii? 



? Cypris Donnetii, Baird, Proc. Zoolog. Soc. London, Pt. XVIII. p. 254, 1850. 



A great many specimens of Cypris were collected by Mr. Garman among 

 the plants growing in the shallow water of the " Marjal." They answer to 

 Baird's description of C. Donnetii from fresh-water ponds, Coquimbo. 



flagellum composed of thirteen segments. Length of body, 4 mm - In the absence of 

 more specimens, I would consider this a variety {gracilicornis) of Allorchestes dtntaius. 



The second species is represented by several specimens. It may be called Allorchestes 

 longistilus, sp. nov. Body smooth, long, and slender. Eyes nearly round. Epimera of 



Fig. 37. 



Allorchestes longistilus, male (nat. 8. 6""".). 



first four thoracic segments quadrilateral. Infero-posterior angles of first three abdom- 

 inal segments produced. Telson entire, with two long seta? on the hind margin. First 

 antenna nearly as long as the second ; flagellum composed of thirteen segments. Car- 

 popodite of second thoracic legs produced below; propodite large, broadest afc distal 

 end; palm oblique, with large setas and a projection at the lower angle. Fifth, sixth, 

 and seventh thoracic legs subequal, the seventh, when extended backward, reaching a 

 short distance beyond the end of the telson. Last pair of caudal stylets very long, ex- 

 tending far beyond the tip of the telson, almost to the end of the second pair of stylets. 

 The female has shorter antennae and small, long, and narrow propodite to second pair of 

 legs. Length of body, 3 mm - to 6 mm - Swamp three mile3 south of Campos. Hartt. 

 Diners from A. dentatus, yar. inermis, in its slenderer body, longer antennas, and espe- 

 cially in the length of the third pair of caudal stylets. 



June, 1876. 



